• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Sealing device (1) for a bearing unit (10), wherein the unit comprises a radially outer ring (11), two rows of rolling elements (12, 13) interposed, respectively, between the ring radially outer ring (11) and a pair of radially inner rings (14, 15). The sealing device comprises a spacer (20) provided with an annular groove (21) and configured to be interposed between the radially inner rings (14, 15) of the rolling unit (10) and a seal (30). housed inside the groove (21) of the spacer (20), wherein the seal (30) has a "U" shape which delimits a volume inside and is configured to be mounted in the annular groove (21) with the concavity (31) facing the axis of symmetry of the rolling unit.
    公开号:FR3040750A1
    申请号:FR1658069
    申请日:2016-08-31
    公开日:2017-03-10
    发明作者:Marco Giovanni Francesco Capozzi；Christian Kogler
    申请人:SKF AB；
    IPC主号:
    专利说明:

    Description attached to an industrial patent application entitled: Sealing device for rolling bearing unit.
    On behalf of: Aktiebolaget SKF Nationality: Swedish Headquarters: 415 50 GOTEBORG (Sweden)
    Designated inventors: Marco Giovanni Francesco CAPOZZI and
    Christian KOGLER DESCRIPTION
    Technical field of the invention
    The present invention relates to a sealing device for a rolling bearing unit with a double row of rolling elements. The sealing device is housed between the two rows of rolling elements and prevents contamination of the bearing grease with debris from contact wear better known as "fretting". The invention is particularly, but not exclusively, suitable for bearing units provided with a central spacer and for railway, off-road and industrial applications, or for renewable energy systems.
    Prior art
    Already known in the state of the art sealing devices to prevent contamination of the bearing grease by debris resulting from "fretting". "Fretting" occurs when two metal bodies in contact and stationary are nevertheless subject to micro-displacements with respect to each other. The resultant contact wear releases iron powder debris that can contaminate the grease that coats and lubricates the bearing components and corresponding bearing tracks of the bearing. It is also known that when debris from "fretting" contaminates the grease, the life of the bearing is compromised and shortens significantly. And of course this is absolutely contrary to the increasingly stringent specifications of rolling bearings, specifications that aim to increase the technical and economic value of the product by requiring a longer and longer life.
    Various attempts have been made by the rolling bearing manufacturers to overcome this disadvantage. For example, EP 1 600 349 A1 describes a seal mounted on a spacer interposed axially between a radially inner ring and an element which creates the axial preload of said inner ring; JP 4 338 116 B2 discloses an anti-fretting device consisting of a polymeric spacer inserted between the pair of inner rings of the bearing; JP 2008 008 424 A discloses a seal made by a three-component composite spacer; finally, JP 2007 292 230 A discloses a composite spacer. However, the solutions described in the cited documents have a high production cost and in some cases are also difficult to mount. In addition, where a polymeric spacer is used, the axial play of the bearing becomes uncertain and this is detrimental to the life of the bearing. Summary of the invention
    The object of the present invention is to provide a simple sealing device able to prevent the debris from "fretting" can reach the inside of the bearing, where are housed the rolling elements, and contaminate their grease of lubrication. This is achieved by applying a special shaped gasket - "U" inverted - to the central spacer interposed between the two inner rings, seal that prevents contamination of the fat by the debris from the "fretting" and at the same time defines a volume within which these debris can be housed. The technical problem is solved by simply making two grooves on the spacers normally used in applications with two radially inner rings and applying the aforesaid seal inside said grooves.
    The present invention therefore describes a sealing device for a rolling bearing unit having the characteristics set forth in the independent claim in the appendix. Other preferred and / or particularly advantageous embodiments of the invention are described according to the features set out in the appended subordinate claims.
    Brief description of the drawings
    The invention will now be described with reference to the drawings in the appendix, which illustrate a few nonlimiting implementations thereof, among which: FIG. 1 is a section in axial symmetry of a rolling unit provided with the device of FIG. sealing according to one embodiment of the present invention, - Figure 2 is a detail of the seal of Figure 1, - Figure 3 is a detail of the groove of the spacer which houses the seal of Figure 2, 4 is another detail of the spacer with a joint assembled inside the groove of the spacer, FIG. 5 shows a plurality of variant embodiments of the seal of FIG. 2, FIG. Figure 6 shows a plurality of implementation variants of the groove of the spacer.
    detailed description
    Referring now to FIG. 1, a bearing unit according to a preferred embodiment of the invention is generally designated 10. As mentioned in the preamble, the invention applies not only to the configuration described below, but more generally to any bearing unit provided with at least two rows of rolling elements and a central spacer interposed between the radially inner rings.
    Throughout the present description and claims, terms and expressions indicating positions and orientations such as "radial" and "axial" are understood to refer to the central axis of rotation X of the rolling unit. 10. The rolling unit 10 comprises a radially outer ring 11 and two rows of rolling elements 12, 13, in this example conical rollers, interposed between the radially outer ring 11 and, respectively, the radially inner rings 14, 15, firmly attached to a fuze F. The present invention is applicable to both bearing unit configurations with rotating outer ring and fixed inner rings as well as configurations with fixed outer ring and rotating inner rings. To simplify the graphical representation, references 12 and 13 will be assigned to either the individual tapered rolls or the entire roll row. For the sake of simplicity, the term "conical roll", used as an example in the present description and in the accompanying drawings, will often be used instead of the more generic term "rolling element" (and it will also be used the same reference numbers). It will be kept in mind that instead of the conical roller, any other rolling element (for example, balls, cylindrical rollers, needles, etc.) can be used.
    The rolling elements of the rows 12, 13 are held in place by corresponding cages 16, 17 (in the example in the figure, the cage 16 for the row of rolling elements 12 and the cage 17 for the row of rolling elements 13) and the entire rolling unit is sealed externally by seals 18 provided for this purpose, for example lip seals.
    The radially inner rings are held in their axial position relative to each other by a spacer 20, which will be fixed, in the case where the inner rings are also fixed, or rotating, in the case where the rings interior are also rotating. In particular, the inner annular surfaces 14 'and 15' of the radially inner rings 14, 15 will be in contact with the annular surfaces 20 'of the spacer 20. These surfaces, from a theoretical point of view, do not have between they of relative motion. In practice, on the other hand, under the effect of the loads induced by the rolling elements on the radially inner rings, relative microdetrations are frequently observed between said surfaces and, in particular, microrotations and / or relative microstriations of the surfaces. annular 14 ', 15' of the inner rings relative to the annular surfaces 20 'of the spacer. Similarly, and for the same reasons, relative microrotations may also be created between the inner cylindrical surfaces 14 ", 15" of the inner rings 14, 15 and the outer cylindrical surface F 'of the F-flare.
    These micro-displacements, as we have already said, by creating a wear of contact between the surfaces in contact generate the known phenomenon of "fretting". The metal powder debris resulting from this wear of contact are therefore free to move inside the rolling unit and will interest, in particular, the area of the rolling elements.
    According to one aspect of the present invention and referring to Figures 2 to 4, this problem is solved by means of a sealing device 1 comprising the spacer 20 and at least one seal 30 characterized by a "U" shape. reversed, ie with the concavity 31 facing the X axis of the rolling unit. The seal, preferably elastomeric material, is housed in an annular groove 21 of the spacer 20. Obviously, it will be advantageous to prepare two grooves 21 in the spacer, each facing an inner ring, and to house a seal 30 in each groove 21.
    The seal 30 is able, in particular, to block the migration of debris resulting from the "fretting" of the zone of the rocket to that of the rolling elements. A preferred embodiment of the seal 30 is the one shown in Figure 2 but, as will be seen later, other shapes are possible, the inverted "U" configuration being well understood. This particular shape, in fact, was designed for a dual purpose: in fact, the seal not only blocks the movement of debris towards the inside of the rolling unit but, thanks to the internal volume delimited by the concavity 31 facing towards X axis of the bearing, it is also able to accumulate debris in its interior. In this way it is avoided that debris can somehow damage the inner rings of the bearing.
    The groove 21 of the spacer may advantageously be provided with features which improve the housing of the seal 30 and in general the behavior of the sealing device. In particular, to avoid oscillations of the seal 30 inside the groove 21, the latter may be provided with a cylindrical surface 21 'radially external having a high roughness. In addition, the groove is preferably configured such that between the annular surfaces of the spacer - the radially inner surface 20 'and the radially outer surface 20 "- there is a difference 2d between the corresponding lengths. in other words, it will be necessary to prove that the radially outer surface 20 "has a lower half-length of the dimension d with respect to the half-length of the radially inner surface 20 '. This precaution makes it possible to avoid contact wear, and resulting fretting debris, between the annular surface 20 "of the spacer and the annular surfaces 14 'and 15' of the radially inner rings of the bearing. it avoids the phenomenon of "fretting" in an area downstream of the seal 30, where obviously the same seal could not be effective.
    In addition, the groove 21 advantageously has a ratio between its depth a and its height b which is greater than one so as to improve the stability of the seal inside the groove during the assembly and transport operations of the device. seal.
    In addition, the height dimension h of the seal 30 must advantageously be smaller than the height b of the groove 21 so as to leave an orifice g close to the cylindrical surface 21 "radially internal of the groove 21, which allows the debris from the "fretting" to enter and fill the inner volume of the joint 30.
    Referring to Figure 5, there is shown a plurality of possible embodiments of the seal 130, 230, 330, 430, 530. Of course, all of these embodiments have in any case a shape of the gasket. U "overturned, ie always with the concavity turned towards the axis X of the bearing. In particular, the seal 130 has an asymmetrical shape of the "legs" of the "U" which leaves a wide passage t (which will be added to the hole previously defined g) and which allows debris to easily enter the inside of the volume delimited by the concavity of the joint. The inclined portions of the "U" shape which, with the radial direction, have respective angles a and β (of equal or different value with respect to each other), allow, on the other hand, easier assembly of the gasket. inside the throat of the spacer. The seals 230, 430, configured according to an inverted but asymmetric "U", as well as the seal 330, which has an outer cylindrical surface 330 'which is particularly rough, are particularly suitable for preventing their exit from the throat of the spacer. Finally, the seal 530 has a concavity in the form of "key lock" and this trick optimizes the internal volume and therefore the amount of debris that can be contained.
    Figure 6, finally, shows a plurality of possible embodiments of the groove 121, 221, 321, 421, 521, 621. For the grooves too, the choice of the project has always aimed to define geometries that can facilitate assembly seal and prevent its exit during assembly and subsequent transport. And this is achieved mainly by using grooves 221, 521, 621 with asymmetrical geometry or by providing a protuberance 421 'in the configuration 421. Each embodiment of the joint, be it the configuration 30 illustrated in FIG. 2 or those shown in FIG. 5, can be used with any embodiment of the groove, whether it is the configuration 21 of FIGS. 3 and 4 or one of the configurations of FIG. 6. It is also possible to use joint shapes and groove shapes that appear to have any combination of features that can be drawn from the examples shown. The object of the present invention, therefore, solves the problem caused by "fretting" in rolling bearings in a very simple and economical way: it suffices to add two joints to the spacers normally used, which will only need the subsequent machining of the two grooves. The joints have been defined with the characteristic "U" shaped inverted shape which, at the same time, not only blocks the passage of debris from "fretting" towards the rolling element zone, but implements a volume able to accommodate debris, avoiding that these can damage the essential components of the bearing. The seals are made of elastomeric material or plastic or similar so as to compensate for any deformation of the inner rings.
    This solution makes it possible to increase the life of the bearing by making it possible not to resort to particular materials, but on the contrary to use for the spacer of steels rather inexpensive and with high machinability. Spacer which in this way can be easily machined to establish the correct axial clearance and can be reused several times, requiring only the replacement of the two joints.
    In addition to the embodiments of the invention as described above, it should be understood that there are many other variants. It should also be understood that said embodiments are only by way of example and do not limit the object of the invention nor its applications or its possible configurations. On the contrary, even if the description reported above allows the skilled person to implement the present invention at least in one of its illustrative configurations, it should be understood that we can design many variants of the components described , without however departing from the object of the invention, as defined in the appended claims, interpreted literally and / or according to their legal equivalents.
    权利要求:
    Claims (9)
    [1" id="c-fr-0001]
    1. Sealing device (1) for a bearing unit (10), the unit comprising a radially outer ring (11), two rows of rolling elements (12, 13) interposed, respectively, between the ring radially outer member (11) and a pair of radially inner rings (14, 15), the sealing device comprising: - a spacer (20) provided with at least one annular groove (21, 121, 221, 321, 421, 521 , 621) and configured to be interposed between the radially inner rings (14, 15) of the rolling unit (10), - at least one seal (30, 130, 230, 330, 430, 530) housed at the interior of said groove (21, 121, 221, 321, 421, 521, 621) of the spacer (20), the sealing device being characterized in that the seal (30, 130, 230, 330, 430, 530) has a "U" shape which delimits a volume in its interior and is configured to be mounted in the annular groove (21, 121, 221, 321, 421, 521, 621) with the concavity (31) rotating e towards the axis of symmetry of the bearing unit.
    [2" id="c-fr-0002]
    2. Sealing device (1) according to claim 1, characterized in that the difference between the half-lengths of a radially outer annular surface (20 ") of the spacer and a radially inner annular surface (20 ') the spacer is equal to a predetermined value (d).
    [3" id="c-fr-0003]
    3. Sealing device (1) according to claim 1 or 2, characterized in that the annular groove (21) has a ratio between its depth (a) and its height (b) greater than one.
    [4" id="c-fr-0004]
    4. Sealing device (1) according to claim 3, characterized in that the height dimension (h) of the seal (30) is less than the height (b) of the groove (21).
    [5" id="c-fr-0005]
    5. Sealing device (1) according to any one of the preceding claims, characterized in that the annular groove (21) is provided with a cylindrical surface (21 '), radially external and rough.
    [6" id="c-fr-0006]
    6. Sealing device (1) according to any one of the preceding claims, characterized in that the seal (130, 230, 430) has a shape of "U" made asymmetrically.
    [7" id="c-fr-0007]
    7. Sealing device (1) according to any one of the preceding claims, characterized in that the seal (330) has a rough outer cylindrical surface (330 ').
    [8" id="c-fr-0008]
    8. Sealing device (1) according to any one of the preceding claims, characterized in that the seal (530) has a concavity shaped "key lock".
    [9" id="c-fr-0009]
    Bearing unit (10) comprising a radially outer ring (11), two rows of rolling elements (12, 13) interposed, respectively, between the radially outer ring (11) and a pair of radially inner rings (14). , 15), characterized in that it further comprises a sealing device (1) according to any one of the preceding claims, interposed centrally between the radially inner rings (14, 15).
    类似技术:
    公开号 | 公开日 | 专利标题
    FR3040750A1|2017-03-10|SEALING DEVICE FOR BEARING BEARING UNIT
    EP0649762A1|1995-04-26|Sealing device for a fluid passage through a roller bearing, and roller bearing comprising such a device
    EP1210524B1|2004-01-14|Hybrid ball bearing comprising ceramic balls and steel rings
    EP0656267A1|1995-06-07|Roller bearing equipped with a fluid tight passage device
    FR2945090A1|2010-11-05|BEARING BEARING COMPRISING AN ENVELOPE FOR MAINTAINING ONE OF THE RINGS
    FR2796680A1|2001-01-26|CAGE DEVICE FOR BALL BEARING AND ASSOCIATED BEARING
    FR2926345A1|2009-07-17|SEAL JOINT AND BEARING BEARING COMPRISING SUCH A SEAL
    EP2808570A1|2014-12-03|Bearing provided with a sealing system
    FR2961439A1|2011-12-23|STOP SUSPENSION DEVICE
    FR2941759A1|2010-08-06|AXIAL STRAIGHT SYSTEM
    FR3039600A1|2017-02-03|BEARING ASSEMBLY
    FR3080421A1|2019-10-25|PULLEY DEVICE FOR TILT ROLLER OR ROLLER
    FR2956708A1|2011-08-26|Roller bearing, has rolling bodies maintained in housings arranged on side faces of bridges and radial crown whose free edge is arranged in radial annular groove such that crown forms axial abutment for rolling bodies
    FR3033853A1|2016-09-23|BEARING COMPRISING A WEAR RING
    EP1862683B1|2010-07-21|Roller bearing
    FR3029995A1|2016-06-17|BEARING BEARING COMPRISING A SEALING FLANGE
    FR3032501A1|2016-08-12|MONOBLOC CAGE FOR CYLINDRICAL ROLLER BEARING
    FR3080416A1|2019-10-25|ORIENTATION BEARING WITH SEAL ARRANGEMENT
    FR3006728A1|2014-12-12|BEARING BEARING COMPRISING SEAL JOINTS.
    FR2886693A1|2006-12-08|ANTI-ROTATION DEVICE FOR ROLLING BEARING, AND BEARING AND MACHINE THEREFOR
    FR3029246A1|2016-06-03|CAGE FOR SPHERICAL ROLLER BEARING COMPRISING A DEFLECTOR, BEARING COMPRISING SUCH A CAGE AND METHOD FOR ASSEMBLING SUCH A BEARING
    FR3018568A1|2015-09-18|BEARING BEARING COMPRISING AN ENVELOPE FOR MAINTAINING ONE OF THE RINGS AND A DEVICE FOR SEALING
    FR3097283A1|2020-12-18|SEALED UNIVERSAL SEAL BEARING AND UNIVERSAL SEAL BEARING ASSEMBLY
    FR3068095B1|2019-11-01|ROTATING ROLLING BEARING
    EP3081823B1|2019-11-27|Bearing unit and method for the manufacture of such bearing unit
    同族专利:
    公开号 | 公开日
    ITUB20153371A1|2017-03-03|
    CN106499734B|2019-10-08|
    CN106499734A|2017-03-15|
    US9926979B2|2018-03-27|
    DE102016216641A1|2017-03-09|
    US20170067511A1|2017-03-09|
    FR3040750B1|2019-12-27|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4692040A|1985-05-06|1987-09-08|The Torrington Company|Multirow roller bearing with seals between the races|
    US4702626A|1985-12-19|1987-10-27|Skf Gmbh|Sealing rolling bearing|
    DE3915624A1|1989-05-12|1990-11-15|Skf Gmbh|ROLLER BEARING|
    US5118206A|1991-04-15|1992-06-02|Otto Dennis L|Cone bore seal|
    US5213342A|1992-02-18|1993-05-25|Federal-Mogul Corporation|Lip seal with radially compressible support band|
    US5492419A|1994-07-19|1996-02-20|Ntn Corporation|Cartridge axle pinion bearing assembly|
    NL1008681C2|1998-03-23|1999-09-24|Skf Eng & Res Centre Bv|Train bearing unit with improved anti-frictional corrosion behavior.|
    JP2000104747A|1998-07-29|2000-04-11|Nsk Ltd|Capped rolling bearing|
    JP2004076758A|2002-08-09|2004-03-11|Nsk Ltd|Sealed rolling bearing|
    JP4593171B2|2004-05-24|2010-12-08|Ｎｔｎ株式会社|Railway vehicle bearing device|
    JP2006077962A|2004-09-13|2006-03-23|Nsk Ltd|Sealed type tapered roller bearing|
    JP2006207685A|2005-01-27|2006-08-10|Nachi Fujikoshi Corp|Axle bearing device|
    DE602005008450D1|2005-11-17|2008-09-04|Skf Ab|Sealing device for bearings for supplying compressed air in vehicle tires|
    JP2007292230A|2006-04-26|2007-11-08|Ntn Corp|Wheel bearing with sensor|
    JP4829699B2|2006-06-29|2011-12-07|Ｎｔｎ株式会社|Railway vehicle bearing device|
    JP2008075834A|2006-09-25|2008-04-03|Jtekt Corp|Rolling bearing device|
    JP2008075833A|2006-09-25|2008-04-03|Jtekt Corp|Rolling bearing device|
    FR2955367B1|2010-01-20|2012-05-11|Snr Roulements Sa|AUTOMOTIVE VEHICLE CLUTCH FITTED EQUIPPED WITH A SEALING DEVICE|
    WO2012069274A1|2010-11-22|2012-05-31|Siemens Aktiengesellschaft|Double row bearing assembly|
    CN202118109U|2011-06-08|2012-01-18|瓦房店阿科比轴承有限公司|Novel full-sealed four-row tapered roller bearing|CN106050905B|2016-05-11|2018-10-26|中车大连机车研究所有限公司|Locomotive axle box integral seal axle box bearing|
    DE102018202993A1|2018-02-28|2019-08-29|Aktiebolaget Skf|warehouse|
    CN108437695A|2018-03-19|2018-08-24|中车青岛四方车辆研究所有限公司|Heavy duty goods train axle system|
    US10927904B2|2019-01-22|2021-02-23|Schaeffler Technologies AG & Co. KG|One-way clutch assembly with dual bearings|
    法律状态:
    2017-08-28| PLFP| Fee payment|Year of fee payment: 2 |
    2018-08-29| PLFP| Fee payment|Year of fee payment: 3 |
    2018-09-28| PLSC| Search report ready|Effective date: 20180928 |
    2019-08-28| PLFP| Fee payment|Year of fee payment: 4 |
    2020-08-24| PLFP| Fee payment|Year of fee payment: 5 |
    2021-08-30| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    ITUB2015A003371A|ITUB20153371A1|2015-09-03|2015-09-03|SEALING DEVICE FOR UNITS? ROLLING BEARING|
    IT102015000048377|2015-09-03|
    [返回顶部]